We would like to express our heartfelt thanks to all those who have contributed to making this exhibition possible, in particular the Swedish organizer Mrs. Agnes Widlund, museum inspector Dr. Haavard Rostrup, Copenhagen, whose foreword to the Danish catalog we have been allowed to to use and who have also been helpful to us in other ways, M. Jean Cassou, director of the Musée d'Art Moderne in Paris, who has let us use the introduction to the English catalog for this exhibition, and finally those who have lent the exhibition's works from their own collections. And then we thank the artist himself who has personally participated in the preparations for the exhibition.